Quantum entanglement between 16 million atoms in a solid

Quantum theory is unequivocal: it predicts that a vast number of atoms can be entangled and intertwined by a very strong quantum relationship even in a macroscopic structure. Until now, however, experimental evidence has been mostly lacking, although recent advances have shown the entanglement of 2,900 atoms.
Our group together with Prof. Nicolas Brunner have recently demonstrated the entanglement between 16 million atoms in a crystal. This was done based on the novel theoretical approach of certifying geniune multipartite entanglement for multiatomic ensembles interacting with light. The research is published in Nature Communications while the brief explanation of main results can be found in the University press realease.